Washington, DC

Washington, District of Columbia was a small city on Earth located in the eastern part of the United States of America. The city was not considered part of any state, and instead is located in its own political subdivision, also known as a Federal District. The city was established as the capital city of the United States in the late 18th century.

An overhead detonation is consistent with a radiation attack, where the actual explosion does not touch the majority of a target, but the blast EM pulse and radiation fallout does major damage to inhabitants and technological infrastructure.

The city of Washington had recovered by the late 24th century, becoming a relatively crowded metropolis.

One of the factions in the Temporal Cold War, the Na'kuhl, became stranded in the 20th century, and allied themselves with Nazi Germany. By providing them with advanced weaponry, they enabled German forces to capture Washington along with most of the Atlantic seaboard by 1944. This timeline was negated when the Enterprise, which had been transported back in time by temporal agent Daniels, was able to destroy Vosk's temporal conduit. (ENTepisode: "Storm Front")